Underpinning



Jan. 8, 1929. 1,698,543

' J. B. GoLDsBoRouGl-i UNDERPINNING Filed Oct. 15, 1925 Hgh-2 Patented Jan, 8, 1.929.

JOHN IB. GOLDSBOROU'GH, OF BROOKLYN, NEW YORK.

UNDERIPINNING.

Original application filed October 31, 1918, Serial No. 260,514. Divided and this application filed October 15, y

arches suported by and spanning the piers.`

The present application, which is a division of my copending application referred to above, relates to' an embodiment of the invention for use when the foundation'wall is in such poor condition that there is danger of portions of it giving away under their own weight when the excavations are made. In order to prevent this a reinforcing envelope or a supplemental footing of foundation material is applied to the wall, which is then supported by its inherent arching action reinforced by that of the envelope, while the excavations are being produced and filled with the foundation material constituting the underpinning. I

The particular nature of the invention to. which this specification relates, as wellpas other objects and advantages thereof, will appear most clearly from a description of the preferred embodiment shown in the accompanying drawings in which like reference characters designate like parts in the several views:

supported in the manner disclosed by this f invention, and

Fig. 2 is a cross section of the wall and itsv underpininng taken along line 2-2 of .Fig 1.

In the drawings, 1 represents the rubble masonry foundation wall of a building having a cellar 2 beneath the floor 3, it being assumed that the wall is in such poor condition that its own arching action cannot be entirely relied on for supporting it above the excavations for the underpinning. An envelope 4 of concrete is therefore placed around the face of the kwall that is in the poorest condition, and also under the bottom Serial No. 62,669.

of the wall. The envelope 4 serves to reinforce the wall and prevent it from falling apart when sections olf-fthe earth beneath the wall are excavated.` v

rIhe underpinning of the building is accomplished lin the manner disclosed inthe v abovel mentioned copending application which will be, briefly described.

Spaced shafts 5 are sunk underneath and in alignment with the wall and its envelope 4, during which operation the natural arching action of the reinforced wall 1 bearing on the remaining columns 6 of earth is sufficient to temporarily support the weight of the building. The shafts 5 are filled with foundation material tov form piers upto the y under side of envelope 4 to underpin ther building whereby its weight is transferred to a greater depth. In order to sink shafts 5 underneath and in alignment with thek wall and its reinforcing envelope 4, further additional excavations must be made along one side of the wall in order to make the under side thereof at the positions of the proposed piers accessible, which excavations are filled up when the underpinning has been completed. y

i While this specification and theaccompanying` drawings disclose a specific form of construction, itis to be understood that such disclosure is only employed for the purposes of illustration, and that changes may be freely made in the form and method of emplacement without departing from the spirit of the invention within the scope of the appended claim. p

I claim:

The method of underpinning a building havinga foundation wall of poor conditions which 'consists in reinforcing the wall by constructing around a portion thereof an envelope of foundation material, excavating sections of the earth beneath and in alignment with the reinforced wall while leaving of the. envelope lying between the piers transfer the loadof the building to a greater depth.

In testimony whereof I aix my signature. v

JOHN n.,eonixsnoaouen. 

